Electrocardiograph



FIG. 1 is a perspective view showing the front top and right side of an electrocardiograph incorporating my new design;

FIG. 2 is an enlarged top plan view thereof;

FIG. 3 is a reduced front elevation thereof;

FIG. 4 is a rear elevation thereof;

FIG. 5 is a right side elevation thereof;

FIG. 6 is a left side elevation thereof; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an electrocardiograph, as shown and described. 